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參數(shù)資料
| 型號： | X5645S14-4.5A |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | RTC Module With CPU Supervisor |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | PLASTIC, SOIC-14 |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 117K |
| 代理商： | X5645S14-4.5A |
X5643/X5645
Characteristics subject to change without notice.
3 of 19
REV 1.1.1 3/5/01
www.xicor.com
PRINCIPLES OF OPERATION
Power On Reset
Application of power to the X5643/X5645 activates a
power on reset circuit. This circuit goes active at about
1V and pulls the RESET/RESET pin active. This signal
prevents the system microprocessor from starting to
operate with insufficient voltage or prior to stabilization
of the oscillator. When V
CC
value for 200ms (nominal) the circuit releases RESET/
RESET, allowing the processor to begin executing code.
exceeds the device V
TRIP
Low Voltage Monitoring
During operation, the X5643/X5645 monitors the V
level and asserts RESET/RESET if supply voltage falls
below a preset minimum V
signal prevents the microprocessor from operating in a
power fail or brownout condition. The RESET/RESET
signal remains active until the voltage drops below 1V.
It also remains active until V
V
TRIP
for 200ms.
CC
TRIP
. The RESET/RESET
CC
returns and exceeds
Watchdog Timer
The watchdog timer circuit monitors the microprocessor
activity by monitoring the WDI input. The microproces-
sor must toggle the CS/WDI pin periodically to prevent a
RESET/RESET signal. The CS/WDI pin must be toggled
from HIGH to LOW prior to the expiration of the watchdog
time out period. The state of two nonvolatile control bits
in the status register determine the watchdog timer
period. The microprocessor can change these watchdog
bits, or they may be “l(fā)ocked” by tying the WP pin LOW
and setting the WPEN bit HIGH.
V
The X5643/X5645 has a standard V
(V
TRIP
) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard V
for higher precision in the V
X5645 threshold may be adjusted.
CC
Threshold Reset Procedure
CC
threshold
TRIP
is not exactly right, or
value, the X5643/
TRIP
Setting the V
This procedure sets the V
value. For example, if the current V
new V
TRIP
is 4.6V, this procedure directly makes the
change. If the new setting is lower than the current set-
ting, then it is necessary to reset the trip point before
setting the new value.
TRIP
Voltage
TRIP
to a higher voltage
is 4.4V and the
TRIP
To set the new V
threshold to the Vcc pin and tie the CS/WDI pin and the
WP pin HIGH. RESET/RESET and SO pins are left
unconnected. Then apply the programming voltage V
to both SCK and SI and pulse CS/WDI LOW then
HIGH. Remove V
P
and the sequence is complete.
TRIP
voltage, apply the desired V
TRIP
P
Figure 1. Set V
TRIP
Voltage
Resetting the V
This procedure sets the V
level. For example, if the current V
V
TRIP
is reset, the new V
1.7V. This procedure must be used to set the voltage to
a lower value.
TRIP
Voltage
TRIP
to a “native” voltage
is 4.4V and the
is something less than
TRIP
TRIP
To reset the V
and 5.5V to the V
pin, and the SCK pin HIGH. RESET/RESET and SO
pins are left unconnected. Then apply the programming
voltage V
P
to the SI pin ONLY and pulse CS/WDI LOW
then HIGH. Remove V
P
and the sequence is complete.
TRIP
voltage, apply a voltage between 2.7
pin. Tie the CS/WDI pin, the WP
CC
Figure 2. Reset V
TRIP
Voltage
SCK
SI
V
P
V
P
CS
SCK
SI
V
CC
V
P
CS
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| X68257J | E2 Micro-Peripheral |
| X68257JI | E2 Micro-Peripheral |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X5645S14I | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:CPU Supervisor with 64Kbit SPI EEPROM |
| X5645S14I-2.7 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| X5645S14I-4.5A | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:CPU Supervisor with 64Kbit SPI EEPROM |
| X5645S8-1.8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SPI Serial EEPROM with Supervisory Features |
| X5645S8-2.7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SPI Serial EEPROM with Supervisory Features |
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